Adjustable chair.



M. HANSON.

ADJUSTABLE CHAIR.

APPLICATION FILED JUNE 28, 1912.

1,124,429, Patented Jan. 12,1915.

2 SHBETS-SHEET 1.

THE NORRIS PETERS 50.. PHOTO-LITHQ. WASHINGTON. D C

M. HANSON.

ADJUSTABLE CHAIR.

APPLICATION FILED mm: 28, 1912.

' Patented Jan. 12, 1915.

2 SHEETS-SHEET 2-.

THE NORRIS PEYEPS CO FHDTO-LITL'ON WASHINGTON, By C.

ITEM SATS PATN FFTWE.

MARTIN HANSON, OF CHICAGO, ILLINOIS, ASSIGNOR- TO LOUIS HANSON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ADJUSTABLE CHAIR.

Application filed June 28, 1912.

To all whom it may concern:

Be it known that I, MARTIN HANSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Adjustable Chairs, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved arrangement of controlling devices for an adjustable chair such as used by barber's, dentists and for similar purposes.

It consists of the features and elements of construction described and shown in the drawings as indicated in the claims.

In the drawings :F igure 1 is a partial side elevation of a barbers chair fitted with the devices embodying this invention. Fig. 2 is an enlarged front elevation of the device with parts in section taken as indicated at line 22 of Fig. 1. Fig. 3 is a top plan section taken as indicated at line 3-3 on Fig. 2. Fig. 4 is an axial section with respect to the post taken as indicated at line 44 on. Fig. 3. Fig. 5 is a detail section taken as indicated at line 55 on Fig. 2.

The chair illustrated in the drawings is susceptible to two sorts of adjustment: It is swivelly mounted so as to be rotatable upon its supporting post, 1, and its back, 2, and foot-rest, 3, are inclinable, as indicated in Fig. 1. In connection with these adjustments it is desirable that in use the chair be normally locked in any position in which it may be set, so as to be safe against external disturbance. To avoid complication of mechanism it is also of advantage to have the locking devices both controllable through the same lever; in the present construction the lever, 4, serves this purpose, being inclinable to one side of its vertical position for releasing the swivel lock, and to the other side of such position for releasing the clamp which serves to retain the back and foot-rest at any angle to which they may be adjusted.

Since the back frame, 2, and foot-rest frame, 3, are operatively connected together by a link, 5, which serves to carry an arm rest, 5 they will move together in such a way as to maintain a definite relation to each other, so that control of one of them will serve as a control of both. Such con- Specification of Letters Patent.

Patented J an. 12, 1915.

Serial No. 706,330.

trol is obtained by the use of a pair of clamping jaws, 6 and 7, acting upon a rod, 8, which is pivotally connected to the footrest frame, 3, the clamping jaws, 6 and 7, being carried fixedly with respect to the seat, 9, will maintain the back, 2, and footrest, 3, fixed with relation to said seat, 9, when they are permitted to grip the control rod, 8, and when released therefrom will permit adjustment of the inclination of the parts, 2 and 3, with respect to the seat, 9. Normally, the jaws are caused to grip the rod, 8, by the force of compression springs, of which one is illustrated at, 10, in Fig. 2, coiled about a bolt, 11, which extends from the jaw member, 6, and through the member, 7. Fig. 3 indicates that there are two of these bolts, 11, arranged one on either side of a rock shaft, 12, which carries the hand lever, 4, rigidly secured to its protruding end at the side of the chair.

The jaw, 7, is relatively mounted upon the rock shaft, 12, by means of a journal bracket, 7, while the jaw, 6, is hinged to this bracket at, 6, the proportions shown in Fig. 2 giving the springs, 10, considerable leverage upon the rod, 8, for, gripping it between the jaws. Release of this grip is accomplished through a lever, 13, pivotally carried at, 13 upon the outer end of the jaw, 7, beyond the position of the springs, 10, and having a toe, 13", arranged to exert a prying action upon the extending portion of the jaw, 6, when the lever, 13, is rocked about its pivot, 13

The rock shaft, 12, is provided with a cam, 14, positioned for engaging the opposite end, 13, of the lever, 13; thus when the lever, 4, is swung forward of its vertical mid-position, the cam, 14, rocks the lever, 13, sufliciently to wedge apart the jaws, 6 and 7, and to release their grip upon the control rod, 8, thus permitting the back and foot-rest of the chair to be adjusted to any desired inclination.

As indicated in Fig. 4, the seat, 9, of the chair is carried upon a swivel mounting consisting of the fixed post, 1, whose reduced portion, 1 carries a rotatable member, 15,

- to which the seat, 9, is directly secured. For

the purpose of locking the seat at any point in its rotation the member, 15, carries a clamping device consisting of jaws, 16 and 17, both pivotally secured by a bolt, 18, carried in lugs, 15*, of the rotatable member.

The jaw, 17, is formed with a lug or bracket, 17 which extends through a slot, 16 of the jaw, 16, and carries the pivot pin, 19, of a lever, 20. The shorter arm of this lever, 20, comprises a presser foot, 20*, which engages the outer end of the j aw, 16, while the long arm of the lever is controlled between a compression spring, 21, and a cam, 22, upon the rock shaft, 12. The spring, 21,is stopped against an abutment, 15 of the swivel member, 15, and operates to thrust the presser foot, 20 strongly against the jaw, 16, with a. corresponding re-action upon the jaw, 17, at thepivot, 19, causing the clamp to grip the post at, 1, and thus prevent rotation of the member, 15, relative thereto. But, when the hand lever, l, is swung rearwardly of its vertical position,the cam, 22, is rocked with the shaft, 12, into engagement with the lever, 20, at, 20 thus compressing the spring, 21, and releasing the grip of the jaws, 16 and 17, upon the post, 1 The chair may then be rotated to any desired position, at which it can be locked by merely returning the lever, 4-, to its normal vertical position.

For limiting the rock of the shaft, 12, in either direction, there is mounted thereon a stop device, 23, provided with wings, 23 one of which abuts one of the lugs, 15, at each limiting position of the lever, 4, as indicated in dotted lines in Fig. 4;.

I claim 1. In an adjustable chair which comprises a seat and other parts adjustable relatively thereto, in combination with a post, a casting having a journal bearing by means of which it is rotatively mounted upon the post terminal; a two-membered clamp both of whose members are pivoted to the seat casting at one side of the post terminal and extend therepast to the opposite side; a lever fulcrumed on one of said clamp members at said opposite side and bearing upon the other clamp member for clamping the two members upon the post terminal, the longer arm of the lever being extended back past the post to the side thereof at which said clamping members are pivoted, and means carried by the seat casting at said last mentioned side for actuating said longer arm for clamping the clamp members on the post terminal.

2. In an adjustable chair which comprises a seat and other parts adjustable relativelythereto, in combination with a post, a seat casting having a journal bearing by means of which it is rotatively mounted upon the post terminal; a two-membered clamp both of whose members are pivoted to the seat casting at one side of the post terminal and which extend past the post to the opposite side thereof and are there juxtaposed; a lever fulcrumed' upon one of said clamp members near their point of uxtaposltlon and bearing upon the other clamp member for clamping the two members upon the post terminal, the longer arm of the lever being extended past the post to the side thereof at which said clamping members are pivoted; a spring re-acting between said longer arm and the seat casting for yieldingly clamping the clamp members on said terminal, and means at said side of the post for moving the lever in opposition to the spring to release the clamp.

3. In an adjustable chair whichcomprises a seat and other parts adjustable relatively thereto, in combination with a support terminating in a post, a seat casting journaled on the support for horizontal rotation; a clamp mounted upon the seat casting encompassing the post for being clamped thereon, one member of said clamp being pivoted to the seat casting at one side of the post, said clamp members being juxtaposed for clamping engagement with each other at the opposite side of the post; a lever fulcrumed upon one of said clamp members near their point of juxtaposition and bearing upon the other clamp member near its fulcrum for clamping the two members upon the post; said lever having a longer arm extended from its fulcrum past the, post to the side thereof at which said clamp member is pivoted; a spring re-acting between said longer arm of the lever and the seat casting at said last mentioned side of the post for yieldingly clamping the clamp members on the post; a horizontal. rock-shaft journaled in the seat casting extending transversely of said lever; a cam on the rock-shaft operating on the lever to move it against the action of the spring for releasing the clamp when the shaft is rocked in one direction, and means for rocking the shaft.

l. An adjustable chair which comprises a seat and other parts adjustable relatively thereto, in combination with a post having the upper end reduced forming a shoulder; a seat casting rotatively mounted upon said reduced upper end of the post and lodged on the shoulder thereof; a twomembered clamp, both of whose members are pivoted to the seat casting" at one side of the reduced upper part of the post and which are interlocked at the opposite side; a lever fulcrumed' upon one of the clampmembers near their point ofinterlocking and bearing upon the other member proximate to the lever fulcrum, said lever having a longer arm extending past the post to the side thereof at which said clamp members are pivoted; a springre-acting between the lever and the seat casting at said last mentioned side of the post to yieldingly clamp the clamp members on the post; ahorizontal rock-shaft ournaled in the seat casting extending transversely of said lever; a cam on the rock-shaft operating on the lever to move it against the action of the spring for releasing the clamp when the shaft is rocked in one direction, and a lever-arm for rocking the shaft.

5. In an adjustable chair which comprises a seat and other parts adjustable relatively thereto, a fixed support comprising a terminal post; a seat casting exteriorly journaled on the post for horizontal rotation thereabout; a horizontal rock-shaft journaled in the seat casting; a control-rod for the adjustable parts of the chair extending from one of them slidable cross-wise of the rock-shaft; a clamping device mounted upon the rock-shaft adjacent to the crossing of the control-rod for clamping the rod, said clamping device having a fixed member and a fulcrumed member facing each other and engaging the rods between them near the fulcrum; a spring operating to force the clamping members together; a cam-lever pivoted to the fixed member remotely from said seat at the opposite side thereof from the fulcrum of the other clamp-member, said cam-lever having an arm extending alongside the rook-shaft and a cam on the rook-shaft for engaging said arm for turning the cam-lever about its fulcrum in the direction for releasing the clamp upon rotation of the rock-shaft in one direction, and means for rocking the shaft.

6. In an adjustable chair which comprises a seat and other parts adjustable relatively thereto, in combination with a support, a seat Copies of thll casting exteriorly journaled on the support for horizontal rotation thereabout, a rockshaft horizontally journaled in the seat;

a control-rod for the adjustable parts of the chair; clamping-jaws for the control-rod comprising a fixed-jaw constituting a slide bearing for the rod on the seat casting adjacent to the journal bearing of the rock-shaft thereon; and a pivoted-jaw fulcrumed on the seat-casting near said slide-bearing; a spring which forces the jaws together to grip the rod; a cam with a longer and a shorter lever arm fulcrumed on the fixedjaw remotely from the slide-bearing and at the opposite side thereof from the fulcrum of the pivoted-jaw and having its cam engaging such pivoted jaw remotely from said bearing and at the opposite side of the fulcrum of said cam-lever and having its longer arm extending alongside the rock-shaft; and a cam on the rock-shaft engaging said longer arm to turn the lever about its fulcrum in the direction for releasing the clamp when the shaft is rocked in one direction, and means for rocking the shaft.

In testimony whereof I have hereunto set my hand at Chicago, Illinois, this 25th day of June, 1912. I

LOUIS HANSON, J r., PETER VERBING.

patent may be obtained for five cents each, by addressing the Commissioner of Patent:

Washington, D. 0." 

